GASCO 103L-300-18CO2: 250 PPM CARBON MONOXIDE, 2.5% CARBON DIOXIDE, 2.5 % METHANE (50 % LEL) , 18 % OXYGEN BALANCE NITROGEN CONTAINED IN A 103 LITER STEEL CYLINDER WITH A C-10 CONNECTION. SDS # G-1015, UN1956 Calibration Certificate NIST, Made in the USA |